Single sideband mixer and method of extracting single...

Details Single sideband mixer and method of extracting single... Single sideband mixer and method of extracting single...

2007-04-24

2007-04-24

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Carrier and single sideband

C455S323000, C329S357000

Reexamination Certificate

active

10613439

ABSTRACT:
Single sideband (SSB) mixers and methods of extracting a SSB signal, which are capable of outputting a single frequency using a plurality of mixers and a local oscillating frequency without having to implement phase-shifting. In one embodiment, a single sideband (SSB) mixer comprises a first mixer and a second mixer, wherein the first and second mixers multiply an input IF (intermediate frequency) signal by a local IF signal having the same frequency of the input IF signal; a band-pass filter which passes upper sideband signal output from the first mixer; a third mixer which multiplies the upper sideband signals output from the band-pass filter by a LO (local oscillating) signal; a fourth mixer which multiplies the signals output from the second mixer by the LO signal; and a subtraction device that subtracts output signals of the third mixer from output signals of the fourth mixer. Accordingly, a quadrature local oscillator which displaces a phase of a local oscillating signal by 90° at a high frequency is not required. Also, since the SSB mixer applies the same local oscillating frequency signal to each mixer, the rejection characteristics against undesired signals can be achieved to a level of about 70 dB, experimentally.

REFERENCES:
patent: 4193035 (1980-03-01), Berger
patent: 4642675 (1987-02-01), Gassmann
patent: 5901347 (1999-05-01), Chambers et al.

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